engleski

Temperature resolved impedance spectroscopy: a powerful tool for investigating electrical transport in nanostructured electrodes for solar cells

Modern optoelectronic devices such as photovoltaics repose on having a transparent conducting oxide (TCO) layer as a transparent electrode where aluminium doped zincite (AZO) is often used [1]. AZO has attracted a great attention in many applications because of its nontoxicity, abundancy and affordability better than other TCO materials such as indium tin oxide (ITO) [2]. Even though AZO is a well-known material, its chemical modifications in the course of the synthesis and deposition, along with thereof derived morphology and structural parameters are still not offer straight-forward relations with final functionality. This study offers a comparison of various chemical deposition methods suitable for preparing aluminium doped zincite in two configurations: planar thin-films and nanostructured vertically aligned thin-films. Derived transparent electrodes are structurally characterised by FTIR, Raman, and SEM. More important, the electrical properties are studied employing temperature resolved impedance spectroscopy (IS) in a wide frequency (0.04 Hz – 106 Hz) and temperature (303 K – 513 K) range. IS characterisation attempted to clarify the extent of influence of preparation process, along with nano-structuring of the oxide layer and achieving thin-films, on the electrical transport properties in this type of material. Calculations enabled insights into the dynamics of electrical transport, which was further correlated with structural characteristics of obtained thin-films. The possibility to further tune the applicability of these materials was discussed. Consequently, the results show that electrical conductivity is strongly affected by the choice of the synthesis method.

aluminium doped zincite ; photovoltaic application ; thin-films ; Impedance spectroscopy ;

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